Power operated hedge clippers



Feb. 14, 1933. J. F. GRAHAM 1,897,117

POWER OPERATED HEDGE GLIPPERS Filed Dec. 25, 1931 2 Sheets-Sheet l ATTORNEY Feb 14, 1933. J. F. GRAHAM POWER OPERATED HEDGE CLIPPERS 2 Sheets-Sheet 2 Filed Dec. 23, 1931 L I. 'raiaawgmwm ATTOR N EY Patented Feb. 14, 1933 I UNITED STATES PATENT OFFICE JOSHUA FAIBCHILID GRAHAM, F MAYNARD, MASSACHUSETTS I BOWER OPERATED HEDGE CLIPPERS 7 Application filed December 23, 1931. Serial No. 582,833.

The object of the invention is to provide The head frame 15 is made preferably of a tool particularly adapted for trimming some light material such as aluminum and hedges, so that a uniform contour throughout may be cast or die form, consisting of divergmay be given to the same with a minimum of ing arms to the extremities of which the bar care on the part of the operator; to provide 10 is secured by the screws 12 as aforesaid. 55 a tool of this kind which is power actuated, The head frame 15 at the heel is formed so that the operator is relieved of the strain with a handle receiving socket 16 in which and fatigue attending the trimming operathe tubular handle member 17 is received, the 10 tion; and to provide a hedge trimmer which latter at the end remote from the head frame of parts for power operation and which is cumferential contractile clamp member 19 by of a character susceptible of cheap manuwhich the base-plate is secured to the handle. factul'e, The base plate 18 functions as a mounting 15 With this object in view, the invention conbase for the motor 20 which is provided with parts of which a preferred embodiment is which is interposed a control switch 22 illustrated in the accompanying drawings but mounted on the under face of the base memto which the invention is not to be restricted. ber 18. Actual reduction to practice may dictate cer- Bolts 23 serve as means for securing the 20 tain changes or alterations and the right is motor to the base plate.

claimed to make any which fall within the The mot r f nctions as the operating scope of the appended claim. means for effecting relative movement of I th d wi the cutter bars 10 and 11 and to this end its 25 Figure 1 is a plan view, partly broken drive shaft is coupled to a transmission shaft accordance with the invention. in self-aligning bearings 25, spaced uniform- Fi 2 d 3 are ti nal vi s on th ly along the handle, connection between the. planes indicated by the lines 22 and 33 motor shaft and the transmission shaft being is of simple form, reduced to a small n'umber carrying a base plate 18 provided with a cirsists in a construction and combination of a flexible electric feed conductor 21 within away, of a clipper or trimmer constructed in 24:, hous d n the handle 7 and j rnalled respectively of Figure 1. accomplished through the instrumentality of Figures 4 and 5 are transverse sectional a universal joint 26. views on the planes indicated by the lines The universal joint 26 in the illustrated 44 and 55 respectively of Figure 2. embodiment consists of a disk 26 formed with The cutting elements comprised in the in uniformly spaced openings 26 disposed prefvention are the relatively movable cutter bars erably degrees apart. The members 26",

10 and 11 which are preferably made from of which there are two, mounted one each on 85 tool steel of transversely angular form, so the motor shaftand the transmission shaft, that the cutter bar 11 may lie in the angle of are provided with diametrically disposed lugs the cutter bar 10 to be slidably connected with 26 hose n On f the m m rs 26 entering the latter by means of the screws 12 which 0116 pair Of holes 26 in the disk and those on pa through slots 14 in the bar 11 and the other member entering the remaining through a body hole in the flange of the bar holes. Since the motor drive shaft will in 10, the screws serving to effect rigid connecevery instance almost fall in alignment with tion between the bar 10 and the head frame the transmission shaft, the universal coupling 45 15 is called upon only to compensate for slight The cutter bars 10 and 11 are of toothed variations in alignment. form, the cutting edges being on the side edges The head frame 15 carries a worm gear 27 of the teeth. Relative movement of the bars mounted on a shaft 28 journalled one end in effects passage of the teeth on one across the head frame and the other end in a hous- 50 the teeth on the other, so that any stems or ing 29, the shaft extending through the wall stalks between the teeth may be severed. of the housing 29 on which extending end the 30 is set in motion; The drive diskisiproa A vided with a wrist pin 33, with which a link; In testimony whereof I-aflix myisignaturer 34 is connected; the latter being'formed with- .drive disk is mounted. In mesh with the worm gear is a worm 31 whose shaft is appropriately journalled in the housing and has one end coupled to the transmission shaft by means of a universal Coupling 32, of similar construction to the universal coupling 26.-

Obviously, rotation of the m ojtor imparts r0; tation toj the transmission shaft from which motion is communicated to the "WOIIIIT and worm wheel by which latterfthejdrive dis 'k' a terminal ear 35 pivotally connected with a an car 36 which is carried byith'e cutter bar" 11 andextends through a slot 373m the flange of, theeutter bar 10 Theear 35 has anads; f: 4V "justable connection with the'1ink34 consiste a mgof. nuts 38 engaged with the threaded ex-" mitrof h link lt i ig the e r 5 opposite sides. Byfthis construction, the

I r. v length ofithe link may bevaried, so thatzthe r V cutter bar 11 may be, positioned initially with V rejfereace to the cutter bar 10 to provide for st fi ve limits of movement between; 4 thetwo. a v M r v .flhe head covered on one side with 'ea ripl te 3 i redcin pl by screws s and thisc cover ,plate acts as ,a platform on i h P e s i e f o t hedge being ,1 trimmed maybe deposited, rather than being slots to provide forsliding movement of the upper bar on the lower bar, a head frame comprising divergent arms to the extremities I of which the lower baris' secured, the head frame being formed with a handlereceiving socket at the point ofmjunctureof said arms,

a vrotarylmernber mounted on thehead frame etw' ni aid arm gh w g li oon tion with theupperof saidbars to reciprocate means forfzsaid member thelatter as said member rotates jand driving f? JOSHUQEFKlRCHILD GRAHAM? dEQPPedl -t e'e o n w uld be the case,

due to the open construction of the head frame, if:the latter wereileft uncovered.

Inperforming thehedge clipping or trim i mingoperation it is only necessary, to-start the motor withrthe actuation 'of'the switch 22, when the disk 30-will besetin motion and the cutter bar llprecipitated overthecutterl barlO, due to the operative connectiong bej a; H tweenthe disk and the cutterbar l-l y Proper v "holdingofgthetoolwill,bring the cutterbar t 7 into engagement with -the;b ranches ofthe hedge to be trimmed and anyqprojecting por-l .1 tions will be immediately severedby the coopif erating cutter bars and-this without any. ef-

fort; on. the part of the operator, other than toth'old the device in the proper position.

In order .to provide for sufficientlubricw tion offth'e' transmission shaft 24, the tubular hendleimemberilf lf fi et w h 11. hOlQslat, Points between thexself-aligning bearings,

2'5; j flhus theihandle may be charged with? I lubricant-through the; holes, so that it' may bearingsforthe transmissionshaft. I

findlits w'ay to the intermediate supporting The inventiw h -b e described, what, 1

isclaimed asnew' and-useful is TIL-A 1601 for the purpose indicated. compfi 60;

mg relatively movable cutter bars, of cross- :Sectionally angular formiwith the one dis-' posed i'nfthe angle of the other the flange offf 1 i the'fu per; cutter bar being formed with longitudinal' slots, screws engaged in the flange ,iso 

